Hydraulic press.



No. 775,853. PATENTED NGV. 22, 1904. U. PHILIPP a R. TRENTZSGH.

HYDRAULIC PRESS.

APPLIOATION FILED APR, 19, um.

No MODEL, z muffa-SHEET 1.

VGr 70m wwwa/MQ @m1551- No. 775,853. PATENTBD NOV. 22, 1904. 0. PHILIPP L R. TRENTZSGH.

HYDRAULIC PRESS.

APPLICATION FILED APR.19, 1904.

2 SHEETS-SHEET 2.

No MODEL.

03m/ue www:

ivrrr; rares Patented November f3.2, 1904i.

OTTO PHlLlPP, F DRESDEN, AND ROBICRTI TRENTIZSCl-l, 0F iilillPZlG, (Hillt- MANY, ASSIGNRS T() ELEKTRGRAVRE, (iESELLtiUl-i/-ili T Mll ,lill SCILIRNKTITER HAFITUNG, F LEIPZIG, SELLERI-IAUSEN, (HERR/[ANY HYDRAULIC Ptit-ISS.

SPECIFICATION forming part of Letters Patent No. 775,853, dated November 22, 1904-. Application iiled .lpril 19, 1904. Serial No. 203,829 (No model.)

To (LIZ '1U/1.07m li/f' 71mg/ concern:

Be it known that we, Gr'ro PuILnr, a resident of Dresden, and ROBERT TnnNTZsou, a

resi dent of Leipzig, Germany, citizens of Germany, haveinvented new and useiul Improvements in Hydraulic Presses, oiE which the tollowing is a specification.

This invention relates to a hydraulic press oi the class in which the spindle has an independent movement from the movable platen while the press is running light.

The invention consists more particularly in the means Jfor operating the valve that admits the water to the cylinder during the forward stroke oi the piston and discharges it during the return stroke.

1n the accompanyingdrawings, Figure 1 is a vertical section, partly in elevation, of our improved hydrauiic press; and Fig. 2, a similar view of a modilication.

The numeral l represents the trame oiI the press, provided with a lixed platen 41 and a iixed cylinder 2 above such platen. Within the cylinder 2 moves a hollow piston 6, to the lower end of which the movable platen 9 is attached. The piston 6 is provided with a perforated cover 11, through which passes a pressure-spindle 1, carrying a collar from which the piston 6 is normally suspended. The spindle 1 is guided in a fixed tubular sleeve 27, mounted on frame 40, and is reciprocated in suitable manner. The drawings show the spindle to he made in the form of a rack 46, engaged by a pinion 8, which is adapted to be turned by a hand-lever 7. The pinion 8 is journaled in a fixed bearing oi' sleeve 27.

The water or other liquid is contained within a reservoir 3, having' cover 19, and communicating by channel 12 with cylinder 2. The channel 12 likewise communicates by duct 42'with the cavity oi' piston 6. A valve 4 controls the iiow of liquid between reservoir 3 and channel 12.

The rod 13 of valve t is by link 14 pivoted to an angle-lever 15. This lever is fulcrumed at .16 to a liXed support 43 and carries at one end a weight 18, which tends to normally l open valve et. y The other end oi' lever 15 carries a roller 17, adapted to contact at its lei't 50 side with a. linger 23, movable between such roller and a fixed abutment 26. The finger 23 has a split hub L14, itted on the collar oi: a pinon 20, which engages the teeth i6 ot spin dle 1. The hub 111 is lirictionally held to this 55 collar by a clamp-screw 24. and surrounding spring 25. The pinion 26 adapted to rotate upon a pin i5, mounted on a slidable frame 21. This i'rame is connected to the movable platen 9, and consequently to piston 6, by rod 22,

The operation is as follows: The spindle 1 is lowered to correspondingly lower the hollow piston 6, suspended therefrom, which is lilled with water. The piston will thus remain suspended while the press is running light-z'. e., until the platen 9 strikes the work-piece 10, supported on platen A11. During this time the valve l1 will be open and water will tlow through channel 12 into cylin- 70 der 2 to fill the space vacated by the piston.

As the frame 2l participates in the movement of the piston and spindle, the `pinion 20 will be lowered without rotating, so that the finger 23 will glide down along abutment 26. 75 Thus the iinger will not inilueuce the lever 15, and the valve a will remain open.

When the platen 9 strikes the workpiece 10, the piston 6 will no longer lollow the descent of spindle 1. The latter will therefore 8O descendindependently into the hollow of the piston, and as the trarne 21 is now stationary this independent movement of the spindle will cause its teeth L16 to turn pinion 20. lin this way the finger 23 will be tilted to engage 85 roller 17 and turn lever 15 against weight 18 on fulcrum 16. Thus the valve-stem 13 will be raised and the valve a closed. The spindle l will, during its further descent, displace water in piston 6, which will iiow through duct 1-2 into cylinder 2 to act upon the cover l1 oi" the piston. ln this way working pressure is exerted upon the piston, the force of which depends upon the ratio between cross-section of spindle 1 and area ol" cover 11. 95

Upon the return stroke the spindle 1 will first rise independently until its collar 5 engages cover 11. At the beginning of this movement the pinion 2O Will be turned in the opposite direction, owing to the fact that its frame 21 does not participate in the movement of the spindle. In this Way the finger 23 Will be turned to release roller 17 and permit the lever to be tilted by the action of Weight 18, so as to open valve 4. Vhile the spindle lis raised Within piston 6, Water W ill be sucked from cylinder 2 through duct 42 into the cavity of the piston.

Then the piston 1 has been raised to such a height that its collar 5 engages the cover 11, the piston will participate in the upward movement of the spindle andthe Water from cylinder 2 Will be returned into reservoir 3, as during this latter portion of the return stroke the frame 21 has the same movement as the spindle 1, the pinion 2O will be raised without being rotated, the valve 4E consequently remaining open.

In Fig. 2 the stem 13 of valve 11 is provided with a collar 29, engaged by a spring 28, that normally closes the valve. The roller 17 of lever 15 is engaged at its right side by a nger 23, turning on arbor 15 and bearing With its arm 200 upon spindle 1.

WYhen the spindle begins to descend into the cavity of piston 6, as previously described, the spindle will be Withdrawn from underneath lever-arm 200. In this Way the spring 28 is free to tilt iinger 23, and consequently to close valve L1.

When during the return stroke the spindle rengages lever-arm 200, it Will tilt linger 23, and thereby open valve i against the action of spring 28.

1. In a hydraulic press, the combination of a spindle with aholloW piston suspended therefrom, a surrounding cylinder, a valve-controlled channel adapted to communicate with the cylinder and piston, a frame movable with the piston, and means intermediate the frame and valve for operating the valve, substantially as specified.

2. In a hydraulic press, the combination of a spindle With a hollow piston suspended therefrom, a surrounding cylinder, a valvecontrolled channel adapted to communicate With the cylinder and piston, a frame movable with the piston, a finger pivoted to said frame and operated by the spindle, a lever adapted to be engaged by the iinger, and means for operatively connecting said lever to the valve, substantially as specified.

Signed by us at Leipzig, Germany, this 31st day of March, 1904.

OTTO PHILIPP. ROBERT TRENTZSOH.

Titnessesz RUDOLPH FRICKE, P. V. I. DUNN. 

